1 files changed, 227 insertions, 0 deletions
diff --git a/tdehtml/misc/shared.h b/tdehtml/misc/shared.h
new file mode 100644
index 000000000..d99b327c6
--- /dev/null
+++ b/tdehtml/misc/shared.h
@@ -0,0 +1,227 @@
+/*
+    This file is part of the DOM implementation for KDE.
+    Copyright (C) 2005, 2006 Apple Computer, Inc.
+    Copyright (C) 2002 Lars Knoll
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef SHARED_H
+#define SHARED_H
+
+namespace tdehtml {
+
+template<class type> class Shared
+{
+public:
+    Shared() { _ref=0; /*counter++;*/ }
+    ~Shared() { /*counter--;*/ }
+
+    void ref() { _ref++;  }
+    void deref() {
+	if(_ref) _ref--;
+	if(!_ref)
+	    delete static_cast<type *>(this);
+    }
+    bool hasOneRef() { //kdDebug(300) << "ref=" << _ref << endl;
+    	return _ref==1; }
+
+    int refCount() const { return _ref; }
+//    static int counter;
+protected:
+    unsigned int _ref;
+};
+
+template<class type> class TreeShared
+{
+public:
+    TreeShared() { _ref = 0; m_parent = 0; /*counter++;*/ }
+    TreeShared( type *parent ) { _ref=0; m_parent = parent; /*counter++;*/ }
+    ~TreeShared() { /*counter--;*/ }
+
+    virtual void removedLastRef() { delete static_cast<type*>(this); }
+
+    void ref() { _ref++;  }
+    void deref() {
+	if(_ref) _ref--;
+	if(!_ref && !m_parent) {
+	    removedLastRef();
+	}
+    }
+    bool hasOneRef() { //kdDebug(300) << "ref=" << _ref << endl;
+    	return _ref==1; }
+
+    int refCount() const { return _ref; }
+//    static int counter;
+
+    void setParent(type *parent) { m_parent = parent; }
+    type *parent() const { return m_parent; }
+private:
+    unsigned int _ref;
+protected:
+    type *m_parent;
+};
+
+template <class T> class SharedPtr;
+
+template <class T> bool operator==(const SharedPtr<T> &a, const SharedPtr<T> &b);
+template <class T> bool operator==(const SharedPtr<T> &a, const T *b);
+template <class T> bool operator==(const T *a, const SharedPtr<T> &b);
+
+template <class T> class SharedPtr
+{
+public:
+    SharedPtr() : m_ptr(0) {}
+    explicit SharedPtr(T *ptr) : m_ptr(ptr) { if (m_ptr) m_ptr->ref(); }
+    SharedPtr(const SharedPtr &o) : m_ptr(o.m_ptr) { if (m_ptr) m_ptr->ref(); }
+    ~SharedPtr() { if (m_ptr) m_ptr->deref(); }
+
+    bool isNull() const { return m_ptr == 0; }
+    bool notNull() const { return m_ptr != 0; }
+
+    void reset() { if (m_ptr) m_ptr->deref(); m_ptr = 0; }
+    void reset(T *o) { if (o) o->ref(); if (m_ptr) m_ptr->deref(); m_ptr = o; }
+
+    T * get() const { return m_ptr; }
+    T &operator*() const { return *m_ptr; }
+    T *operator->() const { return m_ptr; }
+
+    bool operator!() const { return m_ptr == 0; }
+
+    template <class C> friend bool operator==(const SharedPtr<C> &a, const SharedPtr<C> &b);
+    template <class C> friend bool operator==(const SharedPtr<C> &a, const C *b);
+    template <class C> friend bool operator==(const C *a, const SharedPtr<C> &b);
+
+    SharedPtr &operator=(const SharedPtr &);
+
+private:
+    T* m_ptr;
+};
+
+template <class T> SharedPtr<T> &SharedPtr<T>::operator=(const SharedPtr<T> &o)
+{
+    if (o.m_ptr)
+        o.m_ptr->ref();
+    if (m_ptr)
+        m_ptr->deref();
+    m_ptr = o.m_ptr;
+    return *this;
+}
+
+template <class T> inline bool operator==(const SharedPtr<T> &a, const SharedPtr<T> &b) { return a.m_ptr == b.m_ptr; }
+template <class T> inline bool operator==(const SharedPtr<T> &a, const T *b) { return a.m_ptr == b; }
+template <class T> inline bool operator==(const T *a, const SharedPtr<T> &b) { return a == b.m_ptr; }
+
+template <class T> inline bool operator!=(const SharedPtr<T> &a, const SharedPtr<T> &b) { return !(a==b); }
+template <class T> inline bool operator!=(const SharedPtr<T> &a, const T *b) { return !(a == b); }
+template <class T> inline bool operator!=(const T *a, const SharedPtr<T> &b) { return !(a == b); }
+
+template <class T, class U> inline SharedPtr<T> static_pointer_cast(const SharedPtr<U> &p) { return SharedPtr<T>(static_cast<T *>(p.get())); }
+template <class T, class U> inline SharedPtr<T> const_pointer_cast(const SharedPtr<U> &p) { return SharedPtr<T>(const_cast<T *>(p.get())); }
+
+//A special pointer for nodes keeping track of the document,
+//which helps distinguish back links from them to it, in order to break
+//cycles
+template <class T> class DocPtr {
+public:
+    DocPtr() : m_ptr(0) {}
+    DocPtr(T *ptr) : m_ptr(ptr) { if (ptr) ptr->selfOnlyRef(); }
+    DocPtr(const DocPtr &o) : m_ptr(o.m_ptr) { if (T *ptr = m_ptr) ptr->selfOnlyRef(); }
+    ~DocPtr() { if (T *ptr = m_ptr) ptr->selfOnlyDeref(); }
+
+    template <class U> DocPtr(const DocPtr<U> &o) : m_ptr(o.get()) { if (T *ptr = m_ptr) ptr->selfOnlyRef(); }
+
+    void resetSkippingRef(T *o) { m_ptr = o; }
+
+    T *get() const { return m_ptr; }
+
+    T &operator*() const { return *m_ptr; }
+    T *operator->() const { return m_ptr; }
+
+    bool operator!() const { return !m_ptr; }
+
+    // this type conversion operator allows implicit conversion to
+    // bool but not to other integer types
+
+    typedef T * (DocPtr::*UnspecifiedBoolType)() const;
+    operator UnspecifiedBoolType() const
+    {
+        return m_ptr ? &DocPtr::get : 0;
+    }
+
+    DocPtr &operator=(const DocPtr &);
+    DocPtr &operator=(T *);
+
+ private:
+    T *m_ptr;
+};
+
+template <class T> DocPtr<T> &DocPtr<T>::operator=(const DocPtr<T> &o)
+{
+    T *optr = o.m_ptr;
+    if (optr)
+        optr->selfOnlyRef();
+    if (T *ptr = m_ptr)
+        ptr->selfOnlyDeref();
+    m_ptr = optr;
+        return *this;
+}
+
+template <class T> inline DocPtr<T> &DocPtr<T>::operator=(T *optr)
+{
+    if (optr)
+        optr->selfOnlyRef();
+    if (T *ptr = m_ptr)
+        ptr->selfOnlyDeref();
+    m_ptr = optr;
+    return *this;
+}
+
+template <class T> inline bool operator==(const DocPtr<T> &a, const DocPtr<T> &b)
+{
+    return a.get() == b.get();
+}
+
+template <class T> inline bool operator==(const DocPtr<T> &a, const T *b)
+{
+    return a.get() == b;
+}
+
+template <class T> inline bool operator==(const T *a, const DocPtr<T> &b)
+{
+    return a == b.get();
+}
+
+template <class T> inline bool operator!=(const DocPtr<T> &a, const DocPtr<T> &b)
+{
+    return a.get() != b.get();
+}
+
+template <class T> inline bool operator!=(const DocPtr<T> &a, const T *b)
+{
+    return a.get() != b;
+}
+
+template <class T> inline bool operator!=(const T *a, const DocPtr<T> &b)
+{
+    return a != b.get();
+}
+
+
+} // namespace
+
+#endif